New type thermowells may reduce fatigue failure

Three chang instrument issued a distorted square heat pipe production line, this solution can reduce the dynamic stress, simplify the process calculation and provide more accurate temperature measurement. This new design aims to solve these problems, at the same time, meet the production requirements of demanding, increase production and ensure the high quality product.

distort square thermowells by inhibiting the dynamic stress caused by eddy current pressure oscillation and improve the reliability and reduce the risk of fatigue failure. The dynamic stress can lead to the vortex-induced vibration ( VIV） , this is the main source of heat sleeve stress failure.

the new design will be VIV was reduced by 90% or more. This helps to simplify the process calculation, no need to adjust the size of the thermowell, so as to reduce the dynamic and frequency limit, thereby saving construction time and reduce cost, without changing the design. It is very applicable to traditional thermowells can meet the ASME PTC 19 global recognition. 3 TW standard, in order to realize the safe and reliable thermocouple casing design.

the distorted square thermowells solve these challenges, because manufacturers rely more on asking them to withstand harsh or changing the process conditions of application.

usually, shorten the traditional thermowells and/or increase the diameter to avoid the eddy current caused by vibration. These changes may lead to the precision of the measurement point to reduce and/or slow response time. ASME PTC 19。 3 TW calculation recommended size adjustment can usually maintain proper measurement point, but in some cases, they are likely to affect the temperature precision, making it difficult to implement.

“ We hope to provide a solution, in case of process design challenge to provide more choices, & throughout; Three chang, the chief engineer Jack Reuvers said. “ If a change in the late stages of the project, may delay the startup time and increase the cost of additional and pressure. Our solution is not only to provide more options, you can also save the design cost, at the same time to provide a safe, stable and high precision temperature measurement is designed. ”